{"common":{"save":0,"post_id":"8074","level":1,"total":10,"point":10,"point_extra":0},"segment":[{"id":"8897","post_id":"8074","mon_id":"1159278","chapter_id":"1159330","question":"<p>Ph\u01b0\u01a1ng trình b\u1eadc hai <span class=\"math-tex\">$ax^2+bx+c=0$<\/span> (a <span class=\"math-tex\">$\\ne$<\/span> 0) tho\u1ea3 mãn a – b + c = 0 có hai nghi\u1ec7m là<\/p>","options":["<strong>A.<\/strong> 1 và <span class=\"math-tex\">$\\dfrac{c}{a}$<\/span>","<strong>B.<\/strong> –1 và <span class=\"math-tex\">$-\\dfrac{c}{a}$<\/span>","<strong>C.<\/strong> 1 và <span class=\"math-tex\">$-\\dfrac{c}{a}$<\/span>","<strong>D.<\/strong> –1 và <span class=\"math-tex\">$\\dfrac{c}{a}$<\/span>"],"correct":"2","level":"1","hint":"","answer":"<p>Ch\u1ecdn <span style=\"color:#16a085;\"><strong>B.<\/strong> –1 và <span class=\"math-tex\">$-\\dfrac{c}{a}$<\/span>.<\/span><\/p><p>Ph\u01b0\u01a1ng trình b\u1eadc hai <span class=\"math-tex\">$ax^2+bx+c=0$<\/span> (a <span class=\"math-tex\">$\\ne$<\/span> 0) tho\u1ea3 mãn a – b + c = 0 có hai nghi\u1ec7m là <span class=\"math-tex\">$x_1=-1$<\/span> và <span class=\"math-tex\">$x_2=-\\dfrac{c}{a}$<\/span>.<\/p>","type":"choose","extra_type":"classic","time":"0","user_id":"127","test":"0","date":"2024-11-27 09:47:14","option_type":"math","len":0},{"id":"8898","post_id":"8074","mon_id":"1159278","chapter_id":"1159330","question":"<p>Ph\u01b0\u01a1ng trình b\u1eadc hai <span class=\"math-tex\">$ax^2+bx+c=0$<\/span> (a <span class=\"math-tex\">$\\ne$<\/span> 0) có hai nghi\u1ec7m <span class=\"math-tex\">$x_1,x_2$<\/span>. N\u1ebfu <span class=\"math-tex\">$x_1x_2=\\dfrac{c}{a}>0$<\/span> thì ph\u01b0\u01a1ng trình có hai nghi\u1ec7m<\/p>","options":["<strong>A.<\/strong> cùng d\u1ea5u","<strong>B.<\/strong> trái d\u1ea5u","<strong>C.<\/strong> cùng d\u01b0\u01a1ng","<strong>D.<\/strong> cùng âm"],"correct":"1","level":"1","hint":"","answer":"<p>Ch\u1ecdn <span style=\"color:#16a085;\"><strong>A.<\/strong> cùng d\u1ea5u.<\/span><\/p><p>Vì tích hai nghi\u1ec7m <span class=\"math-tex\">$x_1x_2=\\dfrac{c}{a}>0$<\/span> nên hai nghi\u1ec7m cùng d\u1ea5u.<\/p>","type":"choose","extra_type":"classic","time":"0","user_id":"127","test":"0","date":"2024-11-27 09:50:43","option_type":"txt","len":2},{"id":"8899","post_id":"8074","mon_id":"1159278","chapter_id":"1159330","question":"<p>Ph\u01b0\u01a1ng trình b\u1eadc hai <span class=\"math-tex\">$ax^2+bx+c=0$<\/span> (a <span class=\"math-tex\">$\\ne$<\/span> 0) có hai nghi\u1ec7m <span class=\"math-tex\">$x_1,x_2$<\/span>. N\u1ebfu <span class=\"math-tex\">$x_1x_2=\\dfrac{c}{a}>0$<\/span> và <span class=\"math-tex\">$x_1+x_2=-\\dfrac{b}{a}<0$<\/span> thì ph\u01b0\u01a1ng trình có hai nghi\u1ec7m<\/p>","options":["<strong>A.<\/strong> cùng d\u1ea5u","<strong>B.<\/strong> trái d\u1ea5u","<strong>C.<\/strong> cùng d\u01b0\u01a1ng","<strong>D.<\/strong> cùng âm"],"correct":"4","level":"1","hint":"","answer":"<p>Ch\u1ecdn <span style=\"color:#16a085;\"><strong>D.<\/strong> cùng âm.<\/span><\/p><p>Vì tích hai nghi\u1ec7m <span class=\"math-tex\">$x_1x_2=\\dfrac{c}{a}>0$<\/span> nên hai nghi\u1ec7m cùng d\u1ea5u mà t\u1ed5ng hai nghi\u1ec7m <span class=\"math-tex\">$x_1+x_2=-\\dfrac{b}{a}<0$<\/span> nên hai nghi\u1ec7m cùng âm.<\/p>","type":"choose","extra_type":"classic","time":"0","user_id":"127","test":"0","date":"2024-11-27 09:53:22","option_type":"txt","len":2}]}
